package com.rzjm.exercise.common.utils;

import cn.hutool.core.util.StrUtil;
import com.rzjm.exercise.common.enums.ExcelType;
import com.rzjm.exercise.common.exception.BusinessException;
import io.swagger.models.auth.In;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.CharUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.awt.Color;
import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.util.List;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static org.apache.poi.ss.usermodel.CellType.*;

public class ExcelUtils<T> {

    private final static Logger log =  LoggerFactory.getLogger(ExcelUtils.class);
    private final static String EXCEL2003 = "xls";
    private final static String EXCEL2007 = "xlsx";


    @Value("${projecturl.exportPath}")
    private String exportPath;

    public static <T> List<T> readExcel(String path, Class<T> cls, MultipartFile file){

        String fileName = file.getOriginalFilename();
        if (!fileName.matches("^.+\\.(?i)(xls)$") && !fileName.matches("^.+\\.(?i)(xlsx)$")) {
            log.error("上传文件格式不正确");
        }
        List<T> dataList = new ArrayList<>();
        Workbook workbook = null;
        try {
            InputStream is = file.getInputStream();
            if (fileName.endsWith(EXCEL2007)) {
//                FileInputStream is = new FileInputStream(new File(path));
                workbook = new XSSFWorkbook(is);
            }
            if (fileName.endsWith(EXCEL2003)) {
//                FileInputStream is = new FileInputStream(new File(path));
                workbook = new HSSFWorkbook(is);
            }
            if (workbook != null) {
                //类映射  注解 value-->bean columns
                Map<String, List<Field>> classMap = new HashMap<>();
                List<Field> fields = Stream.of(cls.getDeclaredFields()).collect(Collectors.toList());
                fields.forEach(
                        field -> {
                            ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                            if (annotation != null) {
                                String value = annotation.value();
                                if (StringUtils.isBlank(value)) {
                                    return;//return起到的作用和continue是相同的 语法
                                }
                                if (!classMap.containsKey(value)) {
                                    classMap.put(value, new ArrayList<>());
                                }
                                field.setAccessible(true);
                                classMap.get(value).add(field);
                            }
                        }
                );
                //索引-->columns
                Map<Integer, List<Field>> reflectionMap = new HashMap<>(16);
                //默认读取第一个sheet
                Sheet sheet = workbook.getSheetAt(0);

                boolean firstRow = true;
                for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
                    Row row = sheet.getRow(i);
                    //首行  提取注解
                    if (firstRow) {
                        for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                            Cell cell = row.getCell(j);
                            String cellValue = getCellValue(cell);
                            if (classMap.containsKey(cellValue)) {
                                reflectionMap.put(j, classMap.get(cellValue));
                            }
                        }
                        firstRow = false;
                    } else {
                        //忽略空白行
                        if (row == null) {
                            continue;
                        }
                        try {
                            T t = cls.newInstance();
                            //判断是否为空白行
                            boolean allBlank = true;
                            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                                if (reflectionMap.containsKey(j)) {
                                    Cell cell = row.getCell(j);
                                    String cellValue = getCellValue(cell);
                                    if (StringUtils.isNotBlank(cellValue)) {
                                        allBlank = false;
                                    }
                                    List<Field> fieldList = reflectionMap.get(j);
                                    fieldList.forEach(
                                            x -> {
                                                try {
                                                    handleField(t, cellValue, x);
                                                } catch (Exception e) {
                                                    log.error(String.format("reflect field:%s value:%s exception!", x.getName(), cellValue), e);
                                                }
                                            }
                                    );
                                }
                            }
                            if (!allBlank) {
                                dataList.add(t);
                            } else {
                                log.warn(String.format("row:%s is blank ignore!", i));
                            }
                        } catch (Exception e) {
                            log.error(String.format("parse row:%s exception!", i), e);
                        }
                    }
                }
            }
        } catch (Exception e) {
            log.error(String.format("parse excel exception!"), e);
        } finally {
            if (workbook != null) {
                try {
                    workbook.close();
                } catch (Exception e) {
                    log.error(String.format("parse excel exception!"), e);
                }
            }
        }
        return dataList;
    }

    public static <T> void writeExcelToFile(ExcelType excelType, String fileName, List<T> dataList, Class<T> cls) {
        Field[] fields = cls.getDeclaredFields();
        List<Field> fieldList = Arrays.stream(fields)
                .filter(field -> {
                    ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                    if (annotation != null && annotation.col() > 0) {
                        field.setAccessible(true);
                        return true;
                    }
                    return false;
                }).sorted(Comparator.comparing(field -> {
                    int col = 0;
                    ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                    if (annotation != null) {
                        col = annotation.col();
                    }
                    return col;
                })).collect(Collectors.toList());

        Workbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("Sheet1");
        AtomicInteger ai = new AtomicInteger();
        {
            Row row = sheet.createRow(ai.getAndIncrement());
            AtomicInteger aj = new AtomicInteger();
            //写入头部
            CellStyle cellStyle = wb.createCellStyle();
            for (int i = 0; i < fieldList.size(); i++) {
                Field field = fieldList.get(i);
                ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                sheet.setColumnWidth((i + 1), 100 * annotation.width());

                String columnName = "";
                if (annotation != null) {
                    columnName = annotation.value();
                }
                Cell cell = row.createCell(aj.getAndIncrement());
                setBorder(wb, cell, cellStyle);
                cell.setCellValue(columnName);
            }
        }
        CellStyle cellStyle = wb.createCellStyle();
        if (org.apache.commons.collections4.CollectionUtils.isNotEmpty(dataList)) {
            for (int i = 0; i < dataList.size(); i++) {
                T t = dataList.get(i);
                Row row1 = sheet.createRow(ai.getAndIncrement());
                AtomicInteger aj = new AtomicInteger();
                for (int j = 0; j < fieldList.size(); j++) {
                    Field field = fieldList.get(j);
                    Class<?> type = field.getType();
                    Object value = "";
                    try {
                        value = field.get(t);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    Cell cell = row1.createCell(aj.getAndIncrement());
                    setBorder(wb, cell, cellStyle);
                    if (value != null) {
                        if (type == Date.class) {
                            String time = DateUtils.getTime((Date) value);
                            cell.setCellValue(time);
                        } else if (type == LocalDateTime.class) {
                            String time = DateUtils.getLocalDateTime((LocalDateTime) value);
                            cell.setCellValue(time);
                        } else if (type == Integer.class) {
                            ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                            String readValueStr = annotation.readValueStr();
                            if (!org.apache.commons.lang3.StringUtils.isBlank(readValueStr)) {
//                                cell.setCellValue(reverseByExp(value.toString(), readValueStr, ","));
                                cell.setCellValue(reverseByExp(cn.hutool.core.convert.Convert.toStr(value), readValueStr, ","));
                            } else {
                                cell.setCellValue(value.toString());
                            }
                        } else {
                            cell.setCellValue(value.toString());
                        }
                    }
                }
            }
        }
        //冻结窗格
        wb.getSheet("Sheet1").createFreezePane(0, 1, 0, 1);
        //生成excel文件

        buildExcelFile(excelType, fileName, wb);
    }


    private static <T> void handleField(T t, String value, Field field) throws Exception {
        Class<?> type = field.getType();
        if (type == null || type == void.class || StringUtils.isBlank(value)) {
            return;
        }
        if (type == Object.class) {
            field.set(t, value);
            //数字类型
        } else if (type.getSuperclass() == null || type.getSuperclass() == Number.class) {
            if (type == int.class || type == Integer.class) {
                field.set(t, NumberUtils.toInt(value));
            } else if (type == long.class || type == Long.class) {
                field.set(t, NumberUtils.toLong(value));
            } else if (type == byte.class || type == Byte.class) {
                field.set(t, NumberUtils.toByte(value));
            } else if (type == short.class || type == Short.class) {
                field.set(t, NumberUtils.toShort(value));
            } else if (type == double.class || type == Double.class) {
                field.set(t, NumberUtils.toDouble(value));
            } else if (type == float.class || type == Float.class) {
                field.set(t, NumberUtils.toFloat(value));
            } else if (type == char.class || type == Character.class) {
                field.set(t, CharUtils.toChar(value));
            } else if (type == boolean.class) {
                field.set(t, BooleanUtils.toBoolean(value));
            } else if (type == BigDecimal.class) {
                field.set(t, new BigDecimal(value));
            }
        } else if (type == Boolean.class) {
            field.set(t, BooleanUtils.toBoolean(value));
        } else if (type == Date.class) {
            //
            field.set(t, value);
        } else if (type == String.class) {
            field.set(t, value);
        } else {
            Constructor<?> constructor = type.getConstructor(String.class);
            field.set(t, constructor.newInstance(value));
        }
    }

    private static String getCellValue(Cell cell) {
        if (cell == null) {
            return "";
        }
        if (cell.getCellType() == NUMERIC) {
            double value = cell.getNumericCellValue();
            short format = cell.getCellStyle().getDataFormat();
            if (org.apache.poi.ss.usermodel.DateUtil.isCellDateFormatted(cell)) {
                SimpleDateFormat sdf = null;
                //System.out.println("cell.getCellStyle().getDataFormat()="+cell.getCellStyle().getDataFormat());
                if (format == 20 || format == 32) {
                    sdf = new SimpleDateFormat("HH:mm");
                } else if (format == 14 || format == 31 || format == 57 || format == 58) {
                    // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
                    sdf = new SimpleDateFormat("yyyy-MM-dd");
                } else {// 日期
                    sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                }
                Date date = org.apache.poi.ss.usermodel.DateUtil
                        .getJavaDate(value);
                return sdf.format(date);
            }
            // 返回数值类型的值 防止数值过大出现e
            NumberFormat nf = NumberFormat.getInstance();
            nf.setGroupingUsed(false);
            String strNumericCellValue = nf.format(cell.getNumericCellValue());
            BigDecimal bg = new BigDecimal(strNumericCellValue);
            return String.valueOf(bg.toPlainString()).trim().replaceAll("[\\t\\n\\r]", " ");
        } else if (cell.getCellType() == STRING) {
            return StrUtil.trimToEmpty(cell.getStringCellValue()).replaceAll("[\\t\\n\\r]", " ");
        } else if (cell.getCellType() == FORMULA) {
            return StrUtil.trimToEmpty(cell.getCellFormula()).replaceAll("[\\t\\n\\r]", " ");
        } else if (cell.getCellType() == BLANK) {
            return "";
        } else if (cell.getCellType() == BOOLEAN) {
            return String.valueOf(cell.getBooleanCellValue()).replaceAll("[\\t\\n\\r]", " ");
        } else if (cell.getCellType() == ERROR) {
            return "ERROR";
        } else {
            return cell.toString().trim().replaceAll("[\\t\\n\\r]", " ");
        }
    }

    public static <T> void writeExcel(HttpServletResponse response, List<T> dataList, Class<T> cls,String name){
        try{

            Field[] fields = cls.getDeclaredFields();
            List<Field> fieldList = Arrays.stream(fields)
                    .filter(field -> {
                        ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                        if (annotation != null && annotation.col() > 0) {
                            field.setAccessible(true);
                            return true;
                        }
                        return false;
                    }).sorted(Comparator.comparing(field -> {
                        int col = 0;
                        ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                        if (annotation != null) {
                            col = annotation.col();
                        }
                        return col;
                    })).collect(Collectors.toList());

            Workbook wb = new XSSFWorkbook();
            Sheet sheet = wb.createSheet("Sheet1");
            AtomicInteger ai = new AtomicInteger();
            {
                Row row = sheet.createRow(ai.getAndIncrement());
                AtomicInteger aj = new AtomicInteger();
                //写入头部
                fieldList.forEach(field -> {
                    ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                    String columnName = "";
                    if (annotation != null) {
                        columnName = annotation.value();
                    }
                    Cell cell = row.createCell(aj.getAndIncrement());

                    CellStyle cellStyle = wb.createCellStyle();
                    cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
                    cellStyle.setAlignment(HorizontalAlignment.CENTER);// 水平
                    cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);


                    Font font = wb.createFont();
                    font.setBold(true);
                    cellStyle.setFont(font);
                    cell.setCellStyle(cellStyle);
                    cell.setCellValue(columnName);
                });
            }
            if (CollectionUtils.isNotEmpty(dataList)) {
                dataList.forEach(t -> {
                    Row row1 = sheet.createRow(ai.getAndIncrement());
                    AtomicInteger aj = new AtomicInteger();
                    fieldList.forEach(field -> {
                        Class<?> type = field.getType();
                        Object value = "";
                        try {
                            value = field.get(t);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                        Cell cell = row1.createCell(aj.getAndIncrement());
                        if (value != null) {
                            if (type == Date.class) {
                                cell.setCellValue(value.toString());
                            } else {
                                cell.setCellValue(value.toString());
                            }
                            cell.setCellValue(value.toString());
                        }
                    });
                });
            }
            //冻结窗格
            wb.getSheet("Sheet1").createFreezePane(0, 1, 0, 1);
            //浏览器下载excel
            buildExcelDocument(name,wb,response);
        }catch (Exception e){
            e.printStackTrace();
        }
        //生成excel文件
//        buildExcelFile(".\\default.xlsx",wb);
    }

    public static <T> void writeExcelNoExcelColumn(HttpServletResponse response, List<Map<Integer, String>> dataList, String name){
        try{

            Workbook wb = new XSSFWorkbook();
            Sheet sheet = wb.createSheet("Sheet1");
            AtomicInteger ai = new AtomicInteger();

            if (CollectionUtils.isNotEmpty(dataList)) {
                for (int i = 0;i < dataList.size(); i++){
                    Row row = sheet.createRow(ai.getAndIncrement());
                    AtomicInteger aj = new AtomicInteger();
                    Map<Integer, String> valueMap = dataList.get(i);
                    for (Integer key : valueMap.keySet()) {
                        String value = valueMap.get(key);
                        // 处理key和value
                        Cell cell = row.createCell(aj.getAndIncrement());
                        cell.setCellValue(value);
                    }

                }
            }
            //冻结窗格
            wb.getSheet("Sheet1").createFreezePane(0, 1, 0, 1);
            //浏览器下载excel
            buildExcelDocument(name,wb,response);
        }catch (Exception e){
            e.printStackTrace();
        }
        //生成excel文件
//        buildExcelFile(".\\default.xlsx",wb);
    }
    /**
     * 浏览器下载excel
     * @param fileName
     * @param wb
     * @param response
     */

    private static void buildExcelDocument(String fileName, Workbook wb, HttpServletResponse response){
        OutputStream out = null;
        try {
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));

//            FileOutputStream outputStream = new FileOutputStream(fileName);
            out = response.getOutputStream();
            wb.write(out);

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                response.flushBuffer();
                out.flush();
                out.close();
                wb.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 生成excel文件
     * @param path 生成excel路径
     * @param wb
     */
    private static  void  buildExcelFile(String path, Workbook wb){

        File file = new File(path);
        if (file.exists()) {
            file.delete();
        }
        try {
            OutputStream out = new FileOutputStream(file);
            wb.write(out);
            out.flush();
            out.close();
            wb.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成excel文件
     *
     * @param wb
     */
    private static void buildExcelFile(ExcelType excelType, String fileName, Workbook wb) {
        String path = excelType.getPath();
        String property = System.getProperty("user.dir");
        String importPath = property + File.separator + path  ;
        File file = new File(importPath);
        if (!file.exists()) {
            file.mkdirs();
        }
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(new File(importPath + File.separator + fileName));
            wb.write(out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }


    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        try{
            // 告诉浏览器用什么软件可以打开此文件
            response.setHeader("content-Type", "application/vnd.ms-excel");
            // 下载文件的默认名称
            response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
            exportExcel(data, response.getOutputStream());
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {
        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);
            wb.write(out);
        } catch(Exception e){
            e.printStackTrace();
        }finally{
            //此处需要关闭 wb 变量
            out.flush();
            out.close();
            wb.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
        try{
            int rowIndex = 0;
            rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
            writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
            autoSizeColumns(sheet, data.getTitles().size() + 1);
        }catch (Exception e){
            e.printStackTrace();
        }

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        int colIndex = 0;

        try{

            Font titleFont = wb.createFont();
            titleFont.setFontName("simsun");
            //titleFont.setBoldweight(Short.MAX_VALUE);
            // titleFont.setFontHeightInPoints((short) 14);
            titleFont.setColor(IndexedColors.BLACK.index);

            XSSFCellStyle titleStyle = wb.createCellStyle();

            titleStyle.setAlignment(HorizontalAlignment.CENTER);// 水平
            titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直
            titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
            titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
            titleStyle.setFont(titleFont);
            setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

            Row titleRow = sheet.createRow(rowIndex);
            // titleRow.setHeightInPoints(25);
            colIndex = 0;

            for (String field : titles) {
                Cell cell = titleRow.createCell(colIndex);
                cell.setCellValue(field);
                cell.setCellStyle(titleStyle);
                colIndex++;
            }

            rowIndex++;
        }catch (Exception e){
            e.printStackTrace();
        }
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        int colIndex = 0;

        try{

            Font dataFont = wb.createFont();
            dataFont.setFontName("simsun");
            // dataFont.setFontHeightInPoints((short) 14);
            dataFont.setColor(IndexedColors.BLACK.index);

            XSSFCellStyle dataStyle = wb.createCellStyle();
//        dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
//        dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
            dataStyle.setFont(dataFont);
            setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

            for (List<Object> rowData : rows) {
                Row dataRow = sheet.createRow(rowIndex);
                // dataRow.setHeightInPoints(25);
                colIndex = 0;

                for (Object cellData : rowData) {
                    Cell cell = dataRow.createCell(colIndex);
                    if (cellData != null) {
                        cell.setCellValue(cellData.toString());
                    } else {
                        cell.setCellValue("");
                    }

                    cell.setCellStyle(dataStyle);
                    colIndex++;
                }
                rowIndex++;
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return rowIndex;
    }

    private static void autoSizeColumns(Sheet sheet, int columnNumber) {
        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(BorderSide.TOP, color);
        style.setBorderColor(BorderSide.LEFT, color);
        style.setBorderColor(BorderSide.RIGHT, color);
        style.setBorderColor(BorderSide.BOTTOM, color);
    }



    private static void setBorder(Workbook wb, Cell cell, CellStyle cellStyle) {
//
//        Font font = wb.createFont();   publictime
//        font.setColor(IndexedColors.BLACK.getIndex());
//        cellStyle.setFont(font);
//
//        cellStyle.setAlignment(HorizontalAlignment.CENTER);
//        System.out.println("11111111===" + new Date());
//        cellStyle.setBorderTop(BorderStyle.THIN);
//        cellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

        cellStyle.setBorderBottom(BorderStyle.THIN);
        cellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());

        cellStyle.setBorderLeft(BorderStyle.THIN);
        cellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());

        cell.setCellStyle(cellStyle);
//        cellStyle.setBorderRight(BorderStyle.THIN);
//        cellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
//        System.out.println("2222222222===" + new Date());
    }


    /**
     * Excel sheet最大行数，默认65536
     */
    public static final int sheetSize = 65536;

    /**
     * 工作表名称
     */
    private String sheetName;

    /**
     * 导出类型（EXPORT:导出数据；IMPORT：导入模板）
     */
    private Excel.Type type;

    /**
     * 工作薄对象
     */
    private Workbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 导入导出数据列表
     */
    private List<T> list;

    /**
     * 注解列表
     */
    private List<Field> fields;

    /**
     * 实体对象
     */
    public Class<T> clazz;

    public ExcelUtils(Class<T> clazz) {
        this.clazz = clazz;
    }

    public void init(List<T> list, String sheetName, Excel.Type type) {
        if (list == null) {
            list = new ArrayList<T>();
        }
        this.list = list;
        this.sheetName = sheetName;
        this.type = type;
        createExcelField();
        createWorkbook();
    }

    /**
     * 对excel表单默认第一个索引名转换成list
     *
     * @return 转换后集合
     */
    public List<T> importExcel(InputStream is) throws Exception {
        return importExcel("Sheet0", is);
    }

    /**
     * 对excel表单指定表格索引名转换成list
     *
     * @param sheetName 表格索引名
     * @return 转换后集合
     */
    public List<T> importExcel(String sheetName, InputStream is) throws Exception {
        this.type = Excel.Type.IMPORT;
        this.wb = WorkbookFactory.create(is);
        List<T> list = new ArrayList<T>();
        Sheet sheet = null;
        if (StringUtils.isNotEmpty(sheetName)) {
            // 如果指定sheet名,则取指定sheet中的内容.
            sheet = wb.getSheet(sheetName);
        } else {
            // 如果传入的sheet名不存在则默认指向第1个sheet.
            sheet = wb.getSheetAt(0);
        }

        if (sheet == null) {
            throw new IOException("文件sheet不存在");
        }

        int rows = sheet.getPhysicalNumberOfRows();

        if (rows > 0) {
            // 默认序号
            int serialNum = 0;
            // 有数据时才处理 得到类的所有field.
            Field[] allFields = clazz.getDeclaredFields();
            // 定义一个map用于存放列的序号和field.
            Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();
            for (int col = 0; col < allFields.length; col++) {
                Field field = allFields[col];
                Excel attr = field.getAnnotation(Excel.class);
                if (attr != null && (attr.type() == Excel.Type.ALL || attr.type() == type)) {
                    // 设置类的私有字段属性可访问.
                    field.setAccessible(true);
                    fieldsMap.put(++serialNum, field);
                }
            }
            for (int i = 1; i < rows; i++) {
                // 从第2行开始取数据,默认第一行是表头.
                Row row = sheet.getRow(i);
                int cellNum = serialNum;
                T entity = null;
                for (int column = 0; column < cellNum; column++) {
                    Object val = this.getCellValue(row, column);

                    // 如果不存在实例则新建.
                    entity = (entity == null ? clazz.newInstance() : entity);
                    // 从map中得到对应列的field.
                    Field field = fieldsMap.get(column + 1);
                    // 取得类型,并根据对象类型设置值.
                    Class<?> fieldType = field.getType();
                    if (String.class == fieldType) {
                        String s = Convert.toStr(val);
                        if (StringUtils.endsWith(s, ".0")) {
                            val = StringUtils.substringBefore(s, ".0");
                        } else {
                            val = Convert.toStr(val);
                        }
                    } else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
                        val = Convert.toInt(val);
                    } else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
                        val = Convert.toLong(val);
                    } else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
                        val = Convert.toDouble(val);
                    } else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
                        val = Convert.toFloat(val);
                    } else if (Date.class == fieldType) {
                        if (val instanceof String) {
                            val = DateUtils.parseDate(val);
                        } else if (val instanceof Double) {
                            val = DateUtil.getJavaDate((Double) val);
                        }
                    }
                    if (StringUtils.isNotNull(fieldType)) {
                        Excel attr = field.getAnnotation(Excel.class);
                        String propertyName = field.getName();
                        if (StringUtils.isNotEmpty(attr.targetAttr())) {
                            propertyName = field.getName() + "." + attr.targetAttr();
                        } else if (StringUtils.isNotEmpty(attr.readConverterExp())) {
                            val = reverseByExp(String.valueOf(val), attr.readConverterExp());
                        }
                        ReflectUtils.invokeSetter(entity, propertyName, val);
                    }
                }
                list.add(entity);
            }
        }
        return list;
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @param list      导出数据集合
     * @param sheetName 工作表的名称
     * @return 结果
     */
    public AjaxResult exportExcel(List<T> list, String sheetName) {
        this.init(list, sheetName, Excel.Type.EXPORT);
        return exportExcel();
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @param sheetName 工作表的名称
     * @return 结果
     */
    public AjaxResult importTemplateExcel(String sheetName) {
        this.init(null, sheetName, Excel.Type.IMPORT);
        return exportExcel();
    }

    /**
     * 对list数据源将其里面的数据导入到excel表单
     *
     * @return 结果
     */
    public AjaxResult exportExcel() {
        OutputStream out = null;
        try {
            // 取出一共有多少个sheet.
            double sheetNo = Math.ceil(list.size() / sheetSize);
            for (int index = 0; index <= sheetNo; index++) {
                createSheet(sheetNo, index);
                Cell cell = null; // 产生单元格

                // 产生一行
                Row row = sheet.createRow(0);
                // 写入各个字段的列头名称
                for (int i = 0; i < fields.size(); i++) {
                    Field field = fields.get(i);
                    Excel attr = field.getAnnotation(Excel.class);
                    // 创建列
                    cell = row.createCell(i);
                    // 设置列中写入内容为String类型
                    cell.setCellType(CellType.STRING);
                    CellStyle cellStyle = wb.createCellStyle();
                    cellStyle.setAlignment(HorizontalAlignment.CENTER);
                    cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                    if (attr.name().indexOf("注：") >= 0) {
                        Font font = wb.createFont();
                        font.setColor(HSSFFont.COLOR_RED);
                        cellStyle.setFont(font);
                        cellStyle.setFillForegroundColor(HSSFColor.HSSFColorPredefined.YELLOW.getIndex());
                        sheet.setColumnWidth(i, 6000);
                    } else {
                        Font font = wb.createFont();
                        // 粗体显示
                        font.setBold(true);
                        // 选择需要用到的字体格式
                        cellStyle.setFont(font);
                        cellStyle.setFillForegroundColor(HSSFColor.HSSFColorPredefined.LIGHT_YELLOW.getIndex());
                        // 设置列宽
                        sheet.setColumnWidth(i, (int) ((attr.width() + 0.72) * 256));
                        row.setHeight((short) (attr.height() * 20));
                    }
                    cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
                    cellStyle.setWrapText(true);
                    cell.setCellStyle(cellStyle);

                    // 写入列名
                    cell.setCellValue(attr.name());

                    // 如果设置了提示信息则鼠标放上去提示.
                    if (StringUtils.isNotEmpty(attr.prompt())) {
                        // 这里默认设了2-101列提示.
                        setHSSFPrompt(sheet, "", attr.prompt(), 1, 100, i, i);
                    }
                    // 如果设置了combo属性则本列只能选择不能输入
                    if (attr.combo().length > 0) {
                        // 这里默认设了2-101列只能选择不能输入.
                        setHSSFValidation(sheet, attr.combo(), 1, 100, i, i);
                    }
                }
                if (Excel.Type.EXPORT.equals(type)) {
                    fillExcelData(index, row, cell);
                }
            }
            String filename = encodingFilename(sheetName);
            out = new FileOutputStream(getAbsoluteFile(filename));
            wb.write(out);
            return AjaxResult.success(filename);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("导出Excel异常{}", e.getMessage());
            throw new BusinessException("导出Excel失败，请联系网站管理员！");
        } finally {
            if (out != null) {
                try {
                    out.flush();
                    out.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (wb != null) {
                try {
                    wb.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 填充excel数据
     *
     * @param index 序号
     * @param row   单元格行
     * @param cell  类型单元格
     */
    public void fillExcelData(int index, Row row, Cell cell) {
        int startNo = index * sheetSize;
        int endNo = Math.min(startNo + sheetSize, list.size());
        // 写入各条记录,每条记录对应excel表中的一行
        CellStyle cs = wb.createCellStyle();
        cs.setAlignment(HorizontalAlignment.CENTER);
        cs.setVerticalAlignment(VerticalAlignment.CENTER);
        for (int i = startNo; i < endNo; i++) {
            row = sheet.createRow(i + 1 - startNo);
            // 得到导出对象.
            T vo = (T) list.get(i);
            for (int j = 0; j < fields.size(); j++) {
                // 获得field.
                Field field = fields.get(j);
                // 设置实体类私有属性可访问
                field.setAccessible(true);
                Excel attr = field.getAnnotation(Excel.class);
                try {
                    // 设置行高
                    row.setHeight((short) (attr.height() * 20));
                    // 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
                    if (attr.isExport()) {
                        // 创建cell
                        cell = row.createCell(j);
                        cell.setCellStyle(cs);
                        if (vo == null) {
                            // 如果数据存在就填入,不存在填入空格.
                            cell.setCellValue("");
                            continue;
                        }

                        // 用于读取对象中的属性
                        Object value = getTargetValue(vo, field, attr);
                        String dateFormat = attr.dateFormat();
                        String readConverterExp = attr.readConverterExp();
                        if (StringUtils.isNotEmpty(dateFormat)) {
                            cell.setCellValue(DateUtils.parseDateToStr(dateFormat, (Date) value));
                        } else if (StringUtils.isNotEmpty(readConverterExp)) {
                            cell.setCellValue(convertByExp(String.valueOf(value), readConverterExp));
                        } else {
                            cell.setCellType(CellType.STRING);
                            // 如果数据存在就填入,不存在填入空格.
                            cell.setCellValue(StringUtils.isNull(value) ? attr.defaultValue() : value + attr.suffix());
                        }
                    }
                } catch (Exception e) {
                    log.error("导出Excel失败{}", e.getMessage());
                }
            }
        }
    }

    /**
     * 设置单元格上提示
     *
     * @param sheet         要设置的sheet.
     * @param promptTitle   标题
     * @param promptContent 内容
     * @param firstRow      开始行
     * @param endRow        结束行
     * @param firstCol      开始列
     * @param endCol        结束列
     * @return 设置好的sheet.
     */
    public static Sheet setHSSFPrompt(Sheet sheet, String promptTitle, String promptContent, int firstRow, int endRow,
                                      int firstCol, int endCol) {
        // 构造constraint对象
        DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("DD1");
        // 四个参数分别是：起始行、终止行、起始列、终止列
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        // 数据有效性对象
        HSSFDataValidation dataValidationView = new HSSFDataValidation(regions, constraint);
        dataValidationView.createPromptBox(promptTitle, promptContent);
        sheet.addValidationData(dataValidationView);
        return sheet;
    }

    /**
     * 设置某些列的值只能输入预制的数据,显示下拉框.
     *
     * @param sheet    要设置的sheet.
     * @param textlist 下拉框显示的内容
     * @param firstRow 开始行
     * @param endRow   结束行
     * @param firstCol 开始列
     * @param endCol   结束列
     * @return 设置好的sheet.
     */
    public static Sheet setHSSFValidation(Sheet sheet, String[] textlist, int firstRow, int endRow, int firstCol,
                                          int endCol) {
        // 加载下拉列表内容
        DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
        // 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        // 数据有效性对象
        HSSFDataValidation dataValidationList = new HSSFDataValidation(regions, constraint);
        sheet.addValidationData(dataValidationList);
        return sheet;
    }

    /**
     * 解析导出值 0=男,1=女,2=未知
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @return 解析后值
     * @throws Exception
     */
    public static String convertByExp(String propertyValue, String converterExp) throws Exception {
        try {
            String[] convertSource = converterExp.split(",");
            for (String item : convertSource) {
                String[] itemArray = item.split("=");
                if (itemArray[0].equals(propertyValue)) {
                    return itemArray[1];
                }
            }
        } catch (Exception e) {
            throw e;
        }
        return propertyValue;
    }

    /**
     * 反向解析值 男=0,女=1,未知=2
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @return 解析后值
     * @throws Exception
     */
    public static String reverseByExp(String propertyValue, String converterExp) throws Exception {
        try {
            String[] convertSource = converterExp.split(",");
            for (String item : convertSource) {
                String[] itemArray = item.split("=");
                if (itemArray[1].equals(propertyValue)) {
                    return itemArray[0];
                }
            }
        } catch (Exception e) {
            throw e;
        }
        return propertyValue;
    }

    /**
     * 反向解析值 男=0,女=1,未知=2
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @return 解析后值
     * @throws Exception
     */
    public static String reverseByExp(String propertyValue, String converterExp, String separator) {
        StringBuilder propertyString = new StringBuilder();
        String[] convertSource = converterExp.split(",");
        for (String item : convertSource) {
            String[] itemArray = item.split("=");
            if (StrUtil.containsAny(separator, propertyValue)) {
                for (String value : propertyValue.split(separator)) {
                    if (itemArray[0].equals(value)) {
                        propertyString.append(itemArray[1] + separator);
                        break;
                    }
                }
            } else {
                if (itemArray[0].equals(propertyValue)) {
                    return itemArray[1];
                }
            }
        }
        return StrUtil.strip(propertyString.toString(), separator);
    }

    /**
     * 编码文件名
     */
    public String encodingFilename(String filename) {
        filename = UUID.randomUUID().toString() + "_" + filename + ".xlsx";
        return filename;
    }

    /**
     * 获取下载路径
     *
     * @param filename 文件名称
     */
    public String getAbsoluteFile(String filename) {
        String downloadPath = Global.getDownloadPath() + filename;
        File desc = new File(downloadPath);
        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        return downloadPath;
    }

    /**
     * 获取bean中的属性值
     *
     * @param vo    实体对象
     * @param field 字段
     * @param excel 注解
     * @return 最终的属性值
     * @throws Exception
     */
    private Object getTargetValue(T vo, Field field, Excel excel) throws Exception {
        Object o = field.get(vo);
        if (StringUtils.isNotEmpty(excel.targetAttr())) {
            String target = excel.targetAttr();
            if (target.indexOf(".") > -1) {
                String[] targets = target.split("[.]");
                for (String name : targets) {
                    o = getValue(o, name);
                }
            } else {
                o = getValue(o, target);
            }
        }
        return o;
    }

    /**
     * 以类的属性的get方法方法形式获取值
     *
     * @param o
     * @param name
     * @return value
     * @throws Exception
     */
    private Object getValue(Object o, String name) throws Exception {
        if (StringUtils.isNotEmpty(name)) {
            Class<?> clazz = o.getClass();
            String methodName = "get" + name.substring(0, 1).toUpperCase() + name.substring(1);
            Method method = clazz.getMethod(methodName);
            o = method.invoke(o);
        }
        return o;
    }

    /**
     * 得到所有定义字段
     */
    private void createExcelField() {
        this.fields = new ArrayList<Field>();
        Field[] allFields = clazz.getDeclaredFields();
        // 得到所有field并存放到一个list中.
        for (Field field : allFields) {
            Excel attr = field.getAnnotation(Excel.class);
            if (attr != null && (attr.type() == Excel.Type.ALL || attr.type() == type)) {
                fields.add(field);
            }
        }
    }

    /**
     * 创建一个工作簿
     */
    public void createWorkbook() {
        this.wb = new SXSSFWorkbook(500);
    }

    /**
     * 创建工作表
     *
     * @param sheetNo             sheet数量
     * @param index               序号
     */
    public void createSheet(double sheetNo, int index) {
        this.sheet = wb.createSheet();
        // 设置工作表的名称.
        if (sheetNo == 0) {
            wb.setSheetName(index, sheetName);
        } else {
            wb.setSheetName(index, sheetName + index);
        }
    }

    /**
     * 获取单元格值
     *
     * @param row    获取的行
     * @param column 获取单元格列号
     * @return 单元格值
     */
    public Object getCellValue(Row row, int column) {
        if (row == null) {
            return row;
        }
        Object val = "";
        try {
            Cell cell = row.getCell(column);
            if (cell != null) {
                if (cell.getCellTypeEnum() == CellType.NUMERIC) {
                    val = cell.getNumericCellValue();
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        val = DateUtil.getJavaDate((Double) val); // POI Excel 日期格式转换
                    } else {
                        if ((Double) val % 1 > 0) {
                            val = new DecimalFormat("0.00").format(val);
                        } else {
                            val = new DecimalFormat("0").format(val);
                        }
                    }
                } else if (cell.getCellTypeEnum() == CellType.STRING) {
                    val = cell.getStringCellValue();
                } else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
                    val = cell.getBooleanCellValue();
                } else if (cell.getCellTypeEnum() == CellType.ERROR) {
                    val = cell.getErrorCellValue();
                }

            }
        } catch (Exception e) {
            return val;
        }
        return val;
    }
}
